package com.sky.interceptor;

import com.sky.constant.JwtClaimsConstant;
import com.sky.context.BaseContext;
import com.sky.properties.JwtProperties;
import com.sky.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * jwt令牌校验的拦截器，客户端的拦截器
 * @author 13353
 */
@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;

    /**
     * 校验jwt 令牌
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
       //判断当前拦截到时Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截的不是动态方法，直接放行
            return true;
        }
        //1.从请求头中获取令牌
        //jwtProperties.getUserTokenName() 这个是与前端提前定义好的
        String token = request.getHeader(jwtProperties.getUserTokenName());
        //2.校验令牌
        try {
            log.info("jwt校验: {}",token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);
            Long userId = Long.valueOf(claims.get(JwtClaimsConstant.USER_ID).toString());
            log.info("当前登录用户的id： ", userId);
            BaseContext.setCurrentId(userId);
            return true;
        } catch (Exception e) {
            //不通过，响应401状态码
            response.setStatus(401);
            return false;
        }


    }
}
